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Significant accounting policies - New Standards (Details) - ARS ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Standards and Interpretations issued by the IASB not in force |  |  |  |
Retained earnings |  | $ 7,630 |  |
Income tax expense |  | $ 3,902 | $ 1,594 | $ 1,692
Increase (decrease) due to application of IFRS 15 |  |  |  |
New Standards and Interpretations issued by the IASB not in force |  |  |  |
Service term period |  | 24 months |  |
Contractual assets | $ 781 |  |  |
Deferred tax liabilities | 234 |  |  |
Retained earnings | 547 |  |  |
Advances for mobile handsets acquisitions | Increase (decrease) due to application of IFRS 15 |  |  |  |
New Standards and Interpretations issued by the IASB not in force |  |  |  |
Retained earnings | (48) |  |  |
Retained earnings, before income tax | (68) |  |  |
Income tax expense | (20) |  |  |
Credit losses related to trade receivables | Increase (decrease) due to application of IFRS 9 |  |  |  |
New Standards and Interpretations issued by the IASB not in force |  |  |  |
Retained earnings | (357) |  |  |
Retained earnings, before income tax | (482) |  |  |
Income tax expense | $ (125) |  |  |

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